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I've seen the tutorials on how to grab the first image and display it in a post, and those on grabbing the post_thumbnail and using that in the RSS feed, but does anybody know how to grab the first image attached to a post and use that in the RSS feed? Thanks!

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i actually just finished working on a site that needed images in his feeds so i ended up using this:

function ba_post_image_feeds($content) {
    global $post,$posts;
    $first_img = '';
    $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
    $first_img = $matches [1] [0];


        $content = '<div>' . $first_img . '</div>' . $content;
    return $content;

add_filter('the_excerpt_rss', 'ba_post_image_feeds');
add_filter('the_content_feed', 'ba_post_image_feeds');
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Thanks for the code. Not sure why it didn't work for me. I ended up using a plugin called RSS Custom Field Images and it works great! – RodeoRamsey Mar 5 '11 at 23:26
up vote 0 down vote accepted

I ended up using a plugin called "RSS Custom Field Images" and it worked out of the box for me. I could even edit it to change the size of the image to something more manageable for me.

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Here's another method.

function add_images_to_rss($var) {
    global $post;
    if(has_post_thumbnail($post->ID)) {
        $tid = get_post_thumbnail_id( $post->ID);
        $thumb = wp_get_attachment_image_src($tid, 'thumbnail');
        $thumb_meta = wp_get_attachment_metadata($tid);
        $up = wp_upload_dir();
        print '<enclosure type="'.get_post_mime_type($tid).'" length="'.filesize($up['basedir'].'/'.$thumb_meta['file']).'" url="'.$thumb[0].'" />';
/* Technically this format is RSS2 only */
//    add_action('rss_item','add_images_to_rss');
//    add_action('rdf_item','add_images_to_rss');
//    add_action('atom_entry','add_images_to_rss');
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